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JHamilton, the Detroit Grand Prix circuit timeline goes like this.
1982- Downtown circuit with a hairpin just beyond Turn 5, followed by a 90 to the right and a 90 to the left, which puts you onto Congress right where the right/left meander starts.
1983-88- Downtown circuit essentially as pictured in the first circuit diagram in the opening post, though Turn 1 is pretty much semi-circular rather than a double-90.
1989-91- The 1983-88 downtown circuit, but without the chicane before the pits and start/finish.
1992-97- The short course layout on Belle Isle.
1998-01- The long course layout on Bell Isle.
2007-08, '12- The short course layout on Belle Isle with tightened Turn 8.
2013-Present- The long course layout on Belle Isle with tightened Turn 7.
I hope this clears things up.
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